package kaoshi;

public class Demo3 {
	public static void main(String[] args) {
		new Thread(new Number()).start();
		new Thread(new Zimu()).start();
	}
}
class Number implements Runnable {
	public void run() {
		for(int i=1;i<21;i++){
			for(int j=1;j<27;j++){
				System.out.println(j);
			}
		}
	}
}
class Zimu extends Thread {
	public void run(){
		for(int i=1;i<21;i++){
			for(int j=1;j<27;j++){
				System.out.println((char)(j+64));
			}
		}
	}
}